Centrifugal pump



H. EICHELER.

CENTRIFUGAL PUMP. APPL'lcATloN mep nc.2'7. 1915.

Patented Apr. '11, .1922.

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C n y i 1 Ik y UNirEo STATES T .i n Fi HANS EICHELER, OF WESSELI-NG, NEAR COLOGNE, GERMANY.

CENTRIEUGAL PUMP.

n specificaugnof Lettersratent. Patentedgpr;11,1922. Application filed December 27, 1916. Serial No. 139,203. i

(GRANTEDY ni'vnER 'THE rnovrsIoNs "or THE Ac'r oF Manon' 3, i921, 4i STAT. L., 1313.)

To all whom t may concern: l

Be it known that I, HANs'EicHELnR, subject of the King` of Prussia, German Emperor, residing at IVesseling, near Cologne, Province of the Rhine, Germany, have invented certain new and useful Improvements in Centrifugal Pumps, (for which I have filed an application in Germany August 6, 1914,) of which the following is a specification, reference being had therein to the .accompanying drawing.-

This invention pertains to certainY new and useful improvements in centrifugal pumps.

I-Ieretofore it has been proposed to apply to the back of the wheel of a centrifugal pump an auxiliary wheel intended to relieve the stuffing box. Such devices, however, have not, under all circumstances, served the purpose for which they are designed, especially if the pump acts not only as a sucking pump, but is also intended for liquids supplied to it. The present invention has for its objects among others to provide an improved construction of this general character which will afford complete yrelief of the stuiiing box, and to accomplish this in a most simple and efcient manner. I combine the auxiliary wheel with a thrust balancing disc which serves to throttle the liquid supplied to the auxiliaryv wheel..

Other objects `and advantages of the invention will hereinafter appearv and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawing which represents a` cross section of a centrifugal pump embodying my present improvement.

Referring to the drawings, r

t designates the auxiliary wheel, b the stufngbox, and c the chamber for the liquid entering back into the auxiliary wheel. f is the relieving disc, and gris the main wheel of the pump.

z' designates a part of the casing between which and the wheel g is a chamber h.

m is a chamber between the part z' of the casing and the relieving disc f.

o is ,a chamber surrounding the auxiliary wheel a and from which chamber leads a channel or passage p connected in any suitable manner to the sucking side of the pump.

The operation is as follows r-the-pressure produced by the main wheel g exists in the chamber it between the main wheel g and the To accomplish my object' part of the casing. Thehub 7c ofthe re-` lieving disc f is mounted to revolve with slight play withinran opening in said' part z', so that thek pressure of theliquid from the chamber zA and the passage around the said hub lc entering the chamber m which is formed partly in the part z' and partly in the relieving disc f, is strongly throttled.`v

Hence, the pressure in said chamber m being comparatively reduced, the thrust balancing disc is pressed at its end almost with the full overpressure produced by the rotor or wheel g against the part z' of the casing, so that at the point a strong throttling will take place and the inner overpressure is also completely compensated, the stuffing box being, consequently, practically completely relieved. When the pump is sucking, the liquid, passing into the chamber 0, is led ofi17V VAthrough` the channel p connected in any .way to the sucking side of the pump, to the latter, so that it cannot reach the stuffing box. The throttling at a is also independent from the wear andv tear, the thrust balancing disc Y f being at all times strongly pressed against the part il of the casing.

Should, however, the throttling by the relieving disc f be insuiiicient,the auxiliary nected to the other-side of the pump, under the pressure of the incomingliquid. Y

What Iclaim as new is 1. In a centrifugal pump, the combination of a rotor, 'an auxiliary wheel mounted at d the back thereof and a thrust balancing disc connected to said auxiliary wheel, with a member interposed between'said rotor and disc, there being a chamberV between said disc and member to receive fluid under pres-Y iooV sure which is relieved byk movement of the disc from the member, and a chamber for the liquid entering V backirito the auxiliary wheel.

2. The combination of a rotor and an aux-y iliary wheel, with a fixed portion of the casing therebetween, a thrust balancing disc mounted at the back of said auxiliary wheel, there being a chamber between said disc and said portion of the casing to receive fluid under pressure which is relieved by movement of the disc from said portion, and a stufiing box, with a suction chamber between the same .and the auxiliary Wheel and in Communication with the suction side of the rotor.

3. The combination of a rotor and an auxiliary wheel, with a fixed portion of the casing therebetween, a thrust balancing disc mounted ,at the back of said auxiliary Wheel7 there being a chamber between said disc and said portion of the casing to receive fluid under pressure which is relieved by move- HANS EICHELER.

Witnesses B. HONUBITZER, T. HEISFER. 

